<template>
    <div class="login_container">
       <div class="login_box">
           <!-- 头像区域 -->
           <div class="avater_box">
               <img src="../assets/logo1.png" alt="">
           </div>
           <!-- 登录表单区域 -->
           <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login_form">
               <!-- 用户名 -->
              <el-form-item prop="username">
                 <el-input v-model="loginForm.username" prefix-icon="el-icon-user-solid"></el-input>
              </el-form-item >
              <!-- 密码 -->
              <el-form-item prop="password">
                 <el-input v-model="loginForm.password" prefix-icon="el-icon-lock" type="password"></el-input>
              </el-form-item>
              <!-- 按钮区域 -->
              <el-form-item class="btns">
                 <el-button type="primary" @click="login">登录</el-button>
                 <el-button type="info" @click="resetLoginForm">重置</el-button>
              </el-form-item>
           </el-form>
       </div>
    </div>
</template>

<script>
export default {
    data() {
        return {
            //这是登录表单的数据绑定对象
            loginForm:{
                username: 'admin',
                password: '123456'
                        },
            //这是表单的验证规则对象
            loginFormRules: {
                //验证用户名是否合法
                username:[
                    { required: true, message: '请输入登录名称', trigger: 'blur' },
                    { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
                        ],
                //验证密码是否合法
                password:[
                    { required: true, message: '请输入登录密码', trigger: 'blur' },
                    { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
                        ]
                    }
                }
            },
             methods:{
                //点击重置按钮，重置登录表单
                resetLoginForm(){
                    this.$refs.loginFormRef.resetFields();
                },
                //表单的预验证
                login(){
                    this.$refs.loginFormRef.validate( async valid => {
                     if ( !valid ) return;
                    // await 修饰成一个异步函数
                    const { data:res } = await this.$http.post("login",this.loginForm);
                    
                     if( res.meta.status !== 200 ) return  this.$message({
                            message: '登录失败',
                            type: 'error',
                            duration: 1000
                                        });
                            this.$message({
                            showClose: true,
                            message: '登录成功',
                            type: 'success',
                            duration: 1000
                                        });
                // 1.将登录成功之后的 token ,保存到客户端的 sessionStorage中
                //  1.1 项目中除了登录之外的其它 API 接口，必须在登录之后才能访问
                //  1.2  token 只能在当前网站打开期间生效，所以将 token 保存在 sessionStorage 中                  
                    console.log(res);
                    window.sessionStorage.setItem('token',res.data.token)
                // 2. 通过编程式导航跳转到后台主页，路由地址是 /home
                this.$router.push('/home');
            });
        }

    }
    
}
   
</script>

<style lang="less" scoped>
.login_container{
    background-color: #999999;
    height: 100%;
}

.login_box{
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}

.avater_box{
    height: 130px;
    width: 130px;
    border: 1px solod #eeeeee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #dddddd;
    position: absolute;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #ffffff;
    img {
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
    }
}

.login_form{
    position: absolute;
    bottom: 0px;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
}
.btns{
    display: flex;
    justify-content: flex-end;
}
</style>
